I've really enjoyed the series so far, the first three parts have been very good, but this forth entry has been the best yet. It's very grim material, very dark, as a drama it hits hard, and raises some really tough concerns about society. Lennie James was terrific once again, the whole production is slick, and of the highest quality. I'm sure many viewers will have found this upsetting, I certainly did. The show has gone down a much darker path.
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